Loading in 5 sec....

Programming Logic ControllersPowerPoint Presentation

Programming Logic Controllers

- By
**gene** - Follow User

- 80 Views
- Uploaded on

Download Presentation
## PowerPoint Slideshow about ' Programming Logic Controllers' - gene

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

### Programming Logic Controllers

Number Systems and Codes - Chapter 3

Decimal

- Each “place” in the decimal system represents a power of ten
- Hundred’s
- Ten’s
- One’s
- Tenths
- Hundredth’s

Binary

- Each “place” in the binary system represents a power of two
- Four’s
- Two’s
- One’s
- Half’s
- Quarter’s

Hexadecimal

- Each “place” in the hexadecimal system represents a power of sixteen
- 0 – 9 = 0 – 9
- A = 10
- B = 11
- C = 12
- D = 13
- E = 14
- F = 15

Hexadecimal and Binary

- Hex numbers can be preceded with 0x
- Hex is a shorthand way of writing binary.
- Each Hex digit is 4 binary digits
- So hex 0x12 is binary 00010010
- So hex 0xAF is binary 10101111

Octal

- Each “place” in the octal system represents a power of eight
- Each octal digit is 3 binary digits
- Uses digits 0-7
- Some systems indicateoctal numbers using a leading 0
- Eg 023 = 010011
- Eg 075 = 111101

Programming Notes

Many programming environments allow you to specify literal constants in other than decimal formats. The following is one somewhat common syntax.

0x prefix indicates hexadecimal

0b prefixed indicate binary

0 prefix indicates octal

Binary Coded Decimal - BCD

- 4 bits represent a single decimal digit
- Only 0 – 9 are valid
- BCD 0111001100010010 = decimal 7312

Gray Code

- Special encoding system where two successive numbers are one “bit flip” apart
- 00 = 0
- 01 = 1
- 11 = 2
- 10 = 3
- Special uses like optical encoders

Binary Fractions

- Hole around zero
- Decimal .1 has no binary equivalent
- 1/3 has no decimal equivalent (or binary)
- 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + …

Download Presentation

Connecting to Server..